---
title: How it works
description: Learn how Workers AI pre-processes and converts HTML, images, and other files to Markdown.
image: https://developers.cloudflare.com/dev-products-preview.png
---
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# How it works
## Pre-processing
When parsing files before converting them to Markdown, there are some cleanup tasks we do depending on the type of file you are trying to convert.
### HTML
When we detect an HTML file, a series of things happen to the HTML content before it is converted:
* Some elements are ignored, including `script` and `style` tags.
* Meta tags are extracted. These include `title`, `description`, `og:title`, `og:description` and `og:image`.
* [JSON-LD ↗](https://json-ld.org/) content is extracted, if it exists. This will be appended at the end of the converted markdown.
* The base URL to use for resolving relative links is extracted from the `` element1, if it exists, according to the spec (that is, only the first instance of the base URL is counted).
* If the `cssSelector` option is:
* present, then only those elements that match the selector are kept for further processing;
* missing, then elements such as ``, `